Karl Pearson 
345 
his own measurements combined with othei' craniologists' results. But, as we have 
already stated, Poll's data show that he did not probably take the nasal height in 
the same way as Thomson. If we suppose him to have measured to the nasal spine 
this will be about 5^ shorter than Thomson's measurement ("9485 and '9595 factors 
respectively for and $ ). We then obtain results : 
Poll 
? 
Leptorrhine ... 
Mesorrhiiie ... 
Platyrrhine . . . 
50 -O"/, 
50-07, 
0-07 
207 
40 7„ 
40 7, 
which more nearly approach those of other writers, especially when we consider 
the smallness of the numbers Poll had at his command. 
If we turn to Scott we find that in his memoir he measured for nasal height 
the nasio-spinal length, i.e. he did not take the length to the lowest point of 
the pyriform border. He also classified leptorrhine, mesorrhine and platyrrhine 
according to Flower* and did not use the Frankfurt Verstdndigung divisions. Thus 
his nasal index and statements as to class of nasal index are not directly com- 
parable with Thomson's. Accordingly they ought not to be compared directly with 
Thomson's results ; it is difficult, however, to correct for the difference between 
nasio-spinal and nasio-pyriform border heights in the case of Scott's males, for 
Thomson's and his mean values of the heights are here the same. If we assume 
that the multipliers for the indices may be given the values found above — say 
•95 and "96 in round numbers for male and female respectively, — we obtain 
Scott 
? 
Leptorrhine . . . 
Mesorrhine 
Platyrrhine ... 
84-.37„ 
15-77„ 
0-07 
50 7„ 
407 
10 7o 
Thus Scott falls quite reasonably into line with the results of Thomson and 
Duckworth, and all three show precisely the sex difference to which our Professor 
takes exception. The differences in the matter of nasal index in the results of 
various writers, over which Professor Giufitrida-Ruggeri seems to be puzzled, could 
have been largely cleared up had he investigated whether the writers had measured 
the same character or classified its values in the same way. 
* Leptorrhine below 48, mesorrhine from 48 to 53, platyrrhine above 53. This is very different from 
the 47-0 and lower, 47-1—51-0, and 51-1 and above of the Verstiindigung. 
